如何在jinja2中导入loopcontrol

Question

我需要在jinja2中使用break for for循环。 以下是我的代码：

{% for i in range (0, desc) %}{{ desclist[i] }} {% set length = length + desclist[i]|length %}{% if length >= 70 %}{% break %}{% endif %}{% endfor %}

并导入loopcontrol扩展名：

但是，我收到了如下错误：

jinja2.exceptions.TemplateSyntaxError: Encountered unknown tag 'break'.
Jinja was looking for the following tags: 'elif' or 'else' or 'endif'. The
innermost block that needs to be closed is 'if'.

任何想法让这项工作？ 谢谢。